Enid Blyton's Famous Five: Chris Riddell on the fun of reimagining a classic – audio slideshow

To celebrate the 70th anniversary of Enid Blyton's Famous Five, five top illustrators were challenged to create new cover designs. Quentin Blake, Helen Oxenbury, Emma Chichester Clark, Oliver Jeffers and Chris Riddell all joined in. Chris Riddell explains the ideas behind their designs and explores the enduring appeal of Blyton's simpler world. Main photography by Andy Hall